By far the best wheels for a VO 1M or maybe any 1M! Definitely tempting, even seducing...despite crazy pricing I am having daydreaming about those like I ruin the stocks by "accident" and have to give the car and myself an expensive gift
God help all the addicts and midlife victims!

"Um... Honey... a 1M definitely needs - or at least deserves - a decent set of winter wheels. Experts say that these rims [RI-D] are really fit for purpose and compatible with winter tyres, so I got myself a set. Safety first, of course."

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“For ’tis the mind that makes the body rich” (W. Shakespeare, The Taming of the Shrew, Act 4, Scene 3)

"Um... Honey... a 1M definitely needs - or at least deserves - a decent set of winter wheels. Experts say that these rims [RI-D] are really fit for purpose and compatible with winter tyres, so I got myself a set. Safety first, of course."

I love the concept of these wheels. In terms of looks, I'm not crazy about how they look in the 1M (compared to the original wheels), even though they look better than many other alternatives I've seen.

Still, I'd love to see a new, lighter edition of the original BMW 359 wheels, with a wider option for the back of course...

I guess persuading BMW to do that would be nearly impossible. but I would definitely be in if they did so.

My question is, has anyone been able to measure or quantify the performance gains of lighter wheels on a 1M? Perhaps there are handling advantages. Are there advantages in accelerating and braking?

It is difficult to tell in isolation and everything is going to be relative. In summary, changing the wheels is just a means to get the car to get to somewhere.

In terms of performance wise, I won't able to tell now since I also have the Brembo CCM-R Ceramics so I have lost 40kg in total of unsprung weight.

My recent change from Trofeo R to AD08R actually highlight one of the benefits of reducing unsprung - where a track tyre like Trofeo R didn't impact on the ride quality of the car and the suspension was able to soak up all the bumps very well.

I think the true performance gain would be from tuning the suspension and setup with the correct unsprung/tyre combination to give better lap times and comfort - reducing unsprung through a set of lighter wheels would be part of that process. Changing it in isolation would not give you a performance gain which is meaningful on day to day or track driving.